CVE-2011-3556: Unspecified vulnerability in the Java Runtime Environment component in Oracle Java SE JDK and JRE 7, 6 Update

Q: How do I fix CVE-2011-3556?

jdk: upgrade to newer than 1.6.0; jre: upgrade to newer than 1.6.0; jrockit: upgrade to newer than r28.1.4. Exact commands for each OS are on this page.

Q: Is CVE-2011-3556 being exploited?

CVE-2011-3556 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2011-3556 affect?

CVE-2011-3556 affects jdk, jre, jrockit. Severity is high (CVSS 7.5). Unspecified vulnerability in the Java Runtime Environment component in Oracle Java SE JDK and JRE 7, 6 Update 27 and earlier, 5.0 Update 31 and earlier, 1.4.2_33 and earlier, and JRockit R28.1.4 and earlier allows remote attackers to affect

Q: How urgent is CVE-2011-3556?

Priority 56/100. High severity; EPSS top 1%: very likely to be exploited; Public exploit reference

This week

HIGH 7.5UPGRADEUPGRADEUPGRADE

CVE-2011-3556 is a high-severity flaw (CVSS 7.5) affecting jdk, jre, jrockit. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Unspecified vulnerability in the Java Runtime Environment component in Oracle Java SE JDK and JRE 7, 6 Update 27 and earlier, 5.0 Update 31 and earlier, 1.4.2_33 and earlier, and JRockit R28.1.4 and earlier allows remote attackers to affect confidentiality, integrity, and availability, related to RMI, a different vulnerability than CVE-2011-3557.

Why this priority

High severity
EPSS top 1%: very likely to be exploited
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	76.4% (top 1%)
CISA exploited list	No
Published	2011-10-19
Last modified	2026-06-16

Publisher (CNA): Oracle · Vendor: oracle · sun

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2011-10-19 21:55 UTCPublished CVE record published
2026-06-16 23:33 UTCUpdated Record last modified

sun jdk UPGRADE

Affected: 1.7.0 · <= 1.6.0 · 1.6.0 · 1.6.0 update_10 · 1.6.0 update_11 · 1.6.0 update_12 · 1.6.0 update_13 · 1.6.0 update_14

Fixed in: newer than 1.6.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy jdk || rpm -q jdk || jdk --version

2. UPGRADE to newer than 1.6.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade jdk

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade jdk

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

sun jre UPGRADE

Affected: 1.7.0 · <= 1.6.0 · 1.6.0 · 1.6.0 update_1 · 1.6.0 update_10 · 1.6.0 update_11 · 1.6.0 update_12 · 1.6.0 update_13

Fixed in: newer than 1.6.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy jre || rpm -q jre || jre --version

2. UPGRADE to newer than 1.6.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade jre

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade jre

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

oracle jrockit UPGRADE

Affected: <= r28.1.4 · r28.0.0 · r28.0.1 · r28.0.2 · r28.1.0 · r28.1.1 · r28.1.3

Fixed in: newer than r28.1.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy jrockit || rpm -q jrockit || jrockit --version

2. UPGRADE to newer than r28.1.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade jrockit

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade jrockit

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Java RMI - Server Insecure Default Configuration Java Code Execution (Metasploit)
Metasploit: Java RMI Server Insecure Endpoint Code Execution Scanner
Metasploit: Java RMI Server Insecure Default Configuration Java Code Execution

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2011-3556?

jdk: upgrade to newer than 1.6.0; jre: upgrade to newer than 1.6.0; jrockit: upgrade to newer than r28.1.4. Exact commands for each OS are on this page.

Is CVE-2011-3556 being exploited?

CVE-2011-3556 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2011-3556 affect?

CVE-2011-3556 affects jdk, jre, jrockit. Severity is high (CVSS 7.5). Unspecified vulnerability in the Java Runtime Environment component in Oracle Java SE JDK and JRE 7, 6 Update 27 and earlier, 5.0 Update 31 and earlier, 1.4.2_33 and earlier, and JRockit R28.1.4 and earlier allows remote attackers to affect

How urgent is CVE-2011-3556?

Priority 56/100. High severity; EPSS top 1%: very likely to be exploited; Public exploit reference

Software pages

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References

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